I prefer AA battery lights, since I do long distance riding and have no access to charge batteries during the rides. I have been very happy with Busch & Muller Ixon IQ and Dinnotte 200AA as a secondary light. I also use Dynamo Cyo light instead of Ixon on my other bike. The patern on the beam of Ixon is the best I have seen to ride on the road, I usually have the Dinnote set at the lowest settings even when I ride off road , only switching to high on 40 +mph descents. The Dinnote light is mounted on the handlebar and Ixon is on the fork crown. I also run a small 1 LED light on the helmet to read a cue sheet and do small repairs like changing flats in at night.
If you decide to add a Dynohub in the future you could get a $35.00 AA charger that mounts on the fork that charges the AA batteries in the Ixon light .